just out of the box model 00411. I've replaced the new lithium batteries but the units will not sync. I've read other posts. fyi there isn't a white sticker inside the battery compartment on either the base or remote unit.
We can see you are using Energizer Ultimate lithium batteries. We only recommend lithium batteries when the temperatures get to -4 degrees where you live. If you are in a location that applies to we would recommend the Energizer Advanced lithium batteries. The Ulitmate are considered heavy duty and can cause connection issues as well as erroneous readings in the thermometer. Please use a fresh alkaline battery such as Rayovac, Energizer, Duracell or Kirkland. Remove the batteries from both the display and sensor for about 5 minutes. Make sure you are at least 3 feet from electronics such as televisions, microwaves, computers or radios. Put the batteries in the outdoor sensor first looking for the red light to flash. Once the light flashes go ahead and put the batteries back in the display. Give them a minute or two to connect and you should get indoor and outdoor readings on the display. Once this happens you can put the sensor back outside. Thank you. Enjoy your day!